Twin craft



M. PHILIP TWIN CRAFT Sept. 8, 1931.

Filed May 26;, 1930 2 Sheets-$heet l ATTORNEY M. PHILIP TWIN CRAFT Sept. 3, 1931.

Filed May 26, 1930 2 Sheets-Sheet 2 NQNRN .w, g N w mp N? x m Patented Sept. 8, 1931 MARTIN PHILIP, OF SAN DIEGO, CALIFORNIA TWIN CRAFT Application filed. May 26,

My invention relates to twin crafts, and the objects of my invention are:

First, to provide a water craft of this class which is particularly stable and will not easily capsize.

Second, to provide a craft of this class in which the two hulls are capable of considerable relative vertical movement so as to ride over waves independently;

Third, to provide a twin craft of this class in which the two hulls are so interlocked that neither one can roll about its own axis;

Fourth, to provide a twin craft of this class which does not require rudders or the like for steering;

Fifth, to provide a novel means of linking the hulls of a twin craft together; and

Sixth, to provide on the whole a novelly constructed twin craft, which is particularly simple of construction proportional to its functions, durable, which will not readily deteriorate or get out of order.

"With these and other objects in view as will appear hereinafter, my invention consists of certain novel features of construction, combination and arrangement of parts and portions as will be hereinafter described in detail and particularly set forth in the appended claims, reference being had to the accompanying drawings and to the characters of reference thereon, which form a part of this application, in which Figure 1 is a perspective view of my twin craft, with the propelling means therefor omitted; Fig. 2 is a side elevational view thereof, with the propelling means shown by dotted outline; Fig. 3 is a fragmentary plan view of the rear portion of my twin craft; Figs is a front elevational view thereof, with parts and portions in section to facilitate the illustration; and Fig. 5 is a plan view of a litting for supporting the shiftable uprights.

Similar characters of reference refer to efiicient in its action, and p 1930. Serial No. 455,566.

similar parts and portions throughout the several views of the drawings.

Boat hulls 1 and 2, fixed upright 3, fitting 4, pin 5, shiftable upright 6, link member 7 pins 8, fixed upright 9, fitting 10, pin 11, shiftable upright 12, link member 13, pins 14, and propelling means constitute the principal parts and portions of my novel twin craft.

Two boat hulls 1 and 2 are provided, which are practically identical in construction, and are preferably decked over at their front and rear portions 1?) and 2?), respectively. The hulls are provided with cockpits 1c and at their central portions.

Rigidly secured to the decked over portion 1?), adjacent the rear end of the cockpit 10, by means of a foot portion 3a, is an upright 3. The upper portion of the upright is provided with a pair of spaced apart horizontally and rearwardly extending relatively short arm ortions 8b. The upright .3 is mounted at the side of the hull 1 facing the hull 2, as shown best in Figs. 1 and 3.

Secured to the rear end portion of the hull 2, at the side thereof adjacent the hull 1, is a fitting 4E. Arranged intermediate-the ends of the fitting 4 arespaced apart upwardly extending ear portions ia, which are adapted to receive a hinge pin 5 extending transversely with the hull 2.

The hinge pin 5 journals the lower end 611 of a shiftable upright 6. The upper end of the shiftable upright 6 is provided with a pair of short, forwardly extending arm por-. tions 6?).

Arranged in front of and in back ofthe ear portions la, are stops 4?) and 410, which are adapted to limit the arcuate movement of the shiftable upright .6.

The uprights 3 and-6 are joined together by a link member 7. The link member 7 comprises a central portion 7 at extending longitudinally with, above and between the hulls 1 and 2, and is joined at its ends to a transversely extending portion 75, which extends into forward and rearward relation with the uprights G and 3, resiectively. The ends of the transverse portions '75 are provided with end portions 70, which extend forwardly or rearwardly between the extende' end oi the arms 36 or 6?), and are pivotally secured thereto by pins 8.

Secured to the hull 2, forwardly of the cockpit 20, at the side thereof adjacent the hull 1, is an upright 9, identical in construction to the upright 3, being provided with a foot portion 9a at its lower end and horizontally extending arm portions 96 at its upper end. These arm portions extend forwardly or in opposite direction to the arm portions 3?).

Mounted on the bow of the hull 1, at the side thereof adjacent the hull 2, is a fitting 10, identical in construction to the fitting 1, in order to mount this fitting 10 in longitudinal alinement with the upright 3. The hull 1 may be provided with a bracket portion extending laterally therefrom, as shown best in Fig. 4,

The fitting 10 is provided with ear portion 10a, which receive a pin 11 adapted to form a journal for supporting the lower end 1% of a shiftable upright 1:2, similar in con struction to the shiftable upright 6. Rearwardly and forwardly of the ear portions 101;, the fitting 10 is provided with stops 10b and 100, respectively, corresponding to the stops 4?) and 40. The upright 12 is provided with a pair of rearwardly extending arms 12b.

Connecting the arms 95 and 12b is a link member 13, identical in construction to the link member 7 provided with a longitudinally extending central portion 13a, transverse portionsliie connected to the ends thereof and end portions 130 secured to the ends of the transverse portions 13d and joined to the arms 9d or 12d, by means of pins 14.

Mounted in each hull, is a suitable engine 15, which drives a propeller 15a; if desired outboard motors may be mounted at the sterns of the two hulls, or the hulls may be propelled by oars, in fact, any means of inclependently propelling the hull may be used, according to the use to which the craft is put.

Operation of my twin craft is as follows:

When following a straight course, the two motors or other propelling means of the two hulls drive the hulls at the same speed so that the hulls remain abreast each other. In such position the hulls are capable oi. consideral'ile relativevertical movement either for their whole length, or only their bows, or their sterns, as indicated by the dotted lines labeled B in Fig. 2. In addition, considerable relative longitudinal movement may be permitted.

However, each. hullis prevented from a rolling movement about its longitudinal axis by reason of the upright and link members, these being joined along horizontal axes, extending transversely with the hull, as shown best in Figs. 1, 8, and 4. Thus, the center about which the boats may roll is midway between the two hulls, and would require one hull to lift completely out of the water in order to accomplish this movement. This being practically impossible, it can be seen that danger of capsizing the twin craft is negligible.

In orderto accomplish a turn, the speed of the outside hull is increased until the shiftahle uprights 6 and 12' engage the come sponding stops 4b and 10?), or 40 and 100, whereupon further relative longitudinal movement of the two hulls is prevented. By retarding the movement of the inside hull, and increasing the speed of the outside hull, the craft is caused to turn. It can be seen that by reversing the movement of the inside hull, the craft can turn practically in its own length.

liy reason of the fact that the two hulls are practically independent, in their movement, but are interlocked against capsizing, it 1s possible to design the hulls so as to have a minimum resistance in the water without making the craft unruly or dangerous to handle. Thus, a water craft capable of high speed, may be readily constructed, which at the sametilne is safe in its operation.

Though I have shown and described a particular construction, combination and arrangement of parts and portions, I do not wish to be limited to this particular construction, combination and arrangement, but desire to include in the scope of my invention, the construction, combination and arrange ment substantially as set forth in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a water craft of the class described, a pair of twin boat hulls, a vertical support rigidly secured to each hull, the one toward the bow and. the other toward the stern, a similarly positioned horizontally pivoted support on each hull and horizontally oil'set, link means connecting said rigid supports with said pivotedsupports, whereby said boat hulls are retained against movement in yaw, and in roll but permits limited relative vertical movement.

2. In a water craft of the class described, a pair of twin boat hulls, a rigid support on each hull, a pivotal support on each hull, horizontally oiiiset link means connecting said rigid supports with said pivotal supports, whereby said boat hulls are retained against movement in yaw and in roll, and stop means in connection with said pivotal supports for limiting relative longitudinal movement of said boat hulls.

day of May, 1930.

MARTIN PHILIP. 

